I didn't know BSD had an IPv4/IPv6 translation mechanism built-in. On Linux the state of the art seems to be Jool[1], which is unfortunately an out-of-tree kernel module. IIUC, they currently share the limitation of not being able to translate locally-originated packets, which can be annoying unless you have a machine to dedicate to the translation.
Wait this looks interesting. I am a biologist so I might get the terminology wrong. Would this allow me to run a ipv4 to ipv6 and back service?
I got some services with only ipv6 addresses and want clients with only ipv4 (sadly still exists) to at least be able to reach them. So could I dedicate a machine to translating for them using this tool?